ermac | c4540c227faaa119805339efd1e0a1abb22772b9af20234ee9087c1c4e51c14c

Analysis

max time kernel
149s
max time network
149s
platform
android_x86
resource
android-x86-arm-20240221-en
resource tags

androidarch:armarch:x86image:android-x86-arm-20240221-enlocale:en-usos:android-9-x86system
submitted
16-04-2024 22:03

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General

Target

c4540c227faaa119805339efd1e0a1abb22772b9af20234ee9087c1c4e51c14c.apk
Size

1.0MB
MD5

bda05f52fbeccac3a99a89b4aed67d7b
SHA1

22d97fa6c83bc25ad28fb4d40ebd65d2f16d920f
SHA256

c4540c227faaa119805339efd1e0a1abb22772b9af20234ee9087c1c4e51c14c
SHA512

bc585039e488abe99b69cc01e0a5f524521e13b90a4d53dad523b6d65d5d74b5b0aeeed298cfb60fd2f866eddc6678f2ef4d4d042a59ae4b5d18a3ea3b251ba9
SSDEEP

24576:fit4ffiqa8Rvoc+/v6kDQA8SZm2PB4eypNLXFO:fit4fqqRp+/v6EQMZm2PBErLXY

Score

10^/10

ermac banker collection discovery evasion infostealer persistence stealth trojan

Malware Config

Extracted

Family

ermac

http://173.212.219.194:3434

AES_key

Signatures

Ermac
An Android banking trojan first seen in July 2021.
banker trojan infostealer ermac

Makes use of the framework's Accessibility service 2 TTPs 3 IoCs

Retrieves information displayed on the phone screen using AccessibilityService.

collection evasion

Input Injection

T1516

Screen Capture

T1513

description	ioc	Process
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId	nusku.ermacv2.apk
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId	nusku.ermacv2.apk
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByText	nusku.ermacv2.apk

Queries a list of all the installed applications on the device (Might be used in an attempt to overlay legitimate apps) 1 TTPs
banker discovery

Security Software Discovery
T1418.001

Removes its main activity from the application launcher 1 TTPs 1 IoCs

stealth trojan evasion

Suppress Application Icon

T1628.001

pid	Process
4274	nusku.ermacv2.apk

Checks CPU information 2 TTPs 1 IoCs

Checks CPU information which indicate if the system is an emulator.

evasion discovery

System Checks

T1633.001

System Information Discovery

T1426

description	ioc	Process
File opened for read	/proc/cpuinfo	nusku.ermacv2.apk

Checks memory information 2 TTPs 1 IoCs

Checks memory information which indicate if the system is an emulator.

evasion discovery

System Checks

T1633.001

System Information Discovery

T1426

description	ioc	Process
File opened for read	/proc/meminfo	nusku.ermacv2.apk

Makes use of the framework's foreground persistence service 1 TTPs 1 IoCs

Application may abuse the framework's foreground service to continue running in the foreground.

evasion persistence

Foreground Persistence

T1541

description	ioc	Process
Framework service call	android.app.IActivityManager.setServiceForeground	nusku.ermacv2.apk

Acquires the wake lock 1 IoCs

description	ioc	Process
Framework service call	android.os.IPowerManager.acquireWakeLock	nusku.ermacv2.apk

Queries the unique device ID (IMEI, MEID, IMSI) 1 TTPs
discovery

System Network Configuration Discovery
T1422

Requests disabling of battery optimizations (often used to enable hiding in the background). 1 TTPs 1 IoCs

evasion

User Evasion

T1628.002

description	ioc	Process
Intent action	android.settings.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS	nusku.ermacv2.apk

Uses Crypto APIs (Might try to encrypt user data) 1 IoCs

description	ioc	Process
Framework API call	javax.crypto.Cipher.doFinal	nusku.ermacv2.apk

nusku.ermacv2.apk
1⤵
- Makes use of the framework's Accessibility service
- Removes its main activity from the application launcher
- Checks CPU information
- Checks memory information
- Makes use of the framework's foreground persistence service
- Acquires the wake lock
- Requests disabling of battery optimizations (often used to enable hiding in the background).
- Uses Crypto APIs (Might try to encrypt user data)
PID:4274